Cleaned and serviced oil boiler. Replaced the filter, strainer and nozzle. Brushed and vacuumed the heat exchanger. Found a weak ignition transformer and a very rusted out expansion tank. Replaced both and tested the system after the repairs. Performed the tune ups on the air conditioning system. Replaced the two filters, checked pressures and tested. No issues to report. The system are about 16 years old. Replacement is recommended. The customer in interesting in going with all electric in the house and to do away with the oil heating. Told the office to schedule for a comfort advisor to come out and give estimates in the best options for this.